Electric fuse.



S. D. SPRONG & W. E. MUCOY.

ELECTRIC FUSE.

APPLICATION FILED SEPT. 6, 1912.

` '1,094,030' Patented Apr. 21, 1914 'UNITED STATES PATENT OFFICE.

SEVERN D. SPRONG- AND WALTER E. McCOY, OF NEW YORK, N. Y., ASSIGNORS OFONE- THIRD TO FRANK W. SMITH, 0F NEW YORK, N. Y.

ELECTRIC FUSE.

Specicaton of Letters Patent.

Patented Apr. 21, 1914.

To all whomy it may concern.'

Be it known that we, SEvERN D. SPRoNo and "Anrrn E. McCoy, citizens ofthe United States. residing at New York, in the county of New York andState of New York, have invented a certain new and useful Improvement inElectric Fuses, of which the following is a specification.

The invention relates to electric fuses, and provides a constructionwhereby with two circuits, including two fuses and the minivmum numberof circuit terminals, the blowing of the fuse in one circuit willdetermine the rupture of the fuse in the other circuit: thesaidconstruction comprising a U-shaped fuse strip, disposed in asuitable closed tube or casing, into which three circuit terminals, eachof greater conductivity than said strip,

are led and directly connected respectively to the loop and ends of saidstrip.

In the accompanying drawings- Figure 1 is a longitudinal section of ourelectric fuse, and Fig. 2 is a similar view of a modification thereof. iy

Similar letters of reference indicate like parts. l

The fuse case A may be cylindrical and of any suitable material. Thefuse strip B is .in loop or U-form with its arms a, b consimilar plug Gat the opposite .5nd of the" case. When it is desired to bring theyparallel arms a, b ofthe fuse strip nearer; togetherftlie` lterminals C,D mav be inclined towardv one another and carried through inl clinedpassages in a' supporting disk H of porcelain or similar material placedinside the case, as shown in Fig. 2.

Ve here showour fuse disposed in two mutually dependent circuits I, II,each including a generator, J and K. Circuit I includes generator J,terminals C, E and fuse arm u. Circuit II includes generator K, ter-Ininals D, E and fuse arm b. Then either fuse arm blows, it causes arupture of the other arm by reason of its proximity thereto: so thatwhile the two circuits are nor,- mally independent., any cause producinga blowing of the fuse in one'of them, will de termine a break in thekcontinuitv of the other'. l

IVe claim: j

1. An electric fuse, comprising a tube, a closure of insulating materialat each end of said tube, one of said closures having two inwardlyconverging passages,two circuit terminals disposed in said passages, asingle circuit terminal entering said tube through the other closure,and a Ushaped fusestrip having its loop connected to said singleterminal and its ends connected respectively to said two terminals. f

2. An electric' fuse, comprising a tube, plugs of insulating material inthe ends of said tube, a disk of refractory material in said tube andlavingginwardly converging passages,` two circuit terminals extendingthrough one of said plugs and said passages, a single circuit terminalentering said tube through the other plug, and a U-sliaped fuse striphaving its loop connected to said single terminal and its endsconnected` to said two terminals.

In testimony whereof we have atlixed our signatures in presence of twowitnesses.

SEVERN D. SPRONG. IVALTER MCCOY;

Vitnesses: y

Gnn'rnUoi: T. PORTER, Jol-IN DoHER'rY.,

